Programmer since the age of 12 and WordPress developer since 2008 as freelancer and author of more than 200 plugins and more than 20 themes.
In general, yes. WordPress and most plugins will register the CRON jobs they need if they detect that job is not registered. There are, however, some plugins that register jobs on plugin activation, and they will not try to detect if the job is missing or not. But, most plugins will recreate missing jobs.
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